Buggy code:
public class JavaCC extends Task { private static final String LOOKAHEAD = "LOOKAHEAD" ; private static final String CHOICE_AMBIGUITY_CHECK = "CHOICE_AMBIGUITY_CHECK" ; private static final String OTHER_AMBIGUITY_CHECK = "OTHER_AMBIGUITY_CHECK" ; private static final String STATIC = "STATIC" ; private static final String DEBUG_PARSER = "DEBUG_PARSER" ; private static final String DEBUG_LOOKAHEAD = "DEBUG_LOOKAHEAD" ; private static final String DEBUG_TOKEN_MANAGER = "DEBUG_TOKEN_MANAGER" ; private static final String OPTIMIZE_TOKEN_MANAGER = "OPTIMIZE_TOKEN_MANAGER" ; private static final String ERROR_REPORTING = "ERROR_REPORTING" ; private static final String JAVA_UNICODE_ESCAPE = "JAVA_UNICODE_ESCAPE" ; private static final String UNICODE_INPUT = "UNICODE_INPUT" ; private static final String IGNORE_CASE = "IGNORE_CASE" ; private static final String COMMON_TOKEN_ACTION = "COMMON_TOKEN_ACTION" ; private static final String USER_TOKEN_MANAGER = "USER_TOKEN_MANAGER" ; private static final String USER_CHAR_STREAM = "USER_CHAR_STREAM" ; private static final String BUILD_PARSER = "BUILD_PARSER" ; private static final String BUILD_TOKEN_MANAGER = "BUILD_TOKEN_MANAGER" ; private static final String SANITY_CHECK = "SANITY_CHECK" ; private static final String FORCE_LA_CHECK = "FORCE_LA_CHECK" ; private static final String CACHE_TOKENS = "CACHE_TOKENS" ; private final Hashtable optionalAttrs = new Hashtable ( ) ; private File outputDirectory = null ; private File target = null ; private File javaccHome = null ; private CommandlineJava cmdl = new CommandlineJava ( ) ; public void setLookahead ( int lookahead ) { } public void setChoiceambiguitycheck ( int choiceAmbiguityCheck ) { } public void setOtherambiguityCheck ( int otherAmbiguityCheck ) { } public void setStatic ( boolean staticParser ) { } public void setDebugparser ( boolean debugParser ) { } public void setDebuglookahead ( boolean debugLookahead ) { } public void setDebugtokenmanager ( boolean debugTokenManager ) { } public void setOptimizetokenmanager ( boolean optimizeTokenManager ) { } public void setErrorreporting ( boolean errorReporting ) { } public void setJavaunicodeescape ( boolean javaUnicodeEscape ) { } public void setUnicodeinput ( boolean unicodeInput ) { } public void setIgnorecase ( boolean ignoreCase ) { } public void setCommontokenaction ( boolean commonTokenAction ) { } public void setUsertokenmanager ( boolean userTokenManager ) { } public void setUsercharstream ( boolean userCharStream ) { } public void setBuildparser ( boolean buildParser ) { } public void setBuildtokenmanager ( boolean buildTokenManager ) { } public void setSanitycheck ( boolean sanityCheck ) { } public void setForcelacheck ( boolean forceLACheck ) { } public void setCachetokens ( boolean cacheTokens ) { } public void setOutputdirectory ( File outputDirectory ) { } public void setTarget ( File target ) { } public void setJavacchome ( File javaccHome ) { } public JavaCC ( ) { } public void execute ( ) throws BuildException { Enumeration iter = optionalAttrs . keys ( ) ; while ( iter . hasMoreElements ( ) ) { String name = ( ( String ) ( iter . nextElement ( ) ) ) ; Object value = optionalAttrs . get ( name ) ; cmdl . createArgument ( ) . setValue ( ( ( ( "-" + name ) + ":" ) + ( value . toString ( ) ) ) ) ; } if ( ( ( target ) == null ) || ( ! ( target . isFile ( ) ) ) ) { throw new BuildException ( ( "Invalid<seq2seq4repair_space>target:<seq2seq4repair_space>" + ( target ) ) ) ; } if ( ( outputDirectory ) == null ) { outputDirectory = new File ( target . getParent ( ) ) ; } else if ( ! ( outputDirectory . isDirectory ( ) ) ) { throw new BuildException ( "Outputdir<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>directory." ) ; } cmdl . createArgument ( ) . setValue ( ( "-OUTPUT_DIRECTORY:" + ( outputDirectory . getAbsolutePath ( ) ) ) ) ; final File javaFile = getOutputJavaFile ( outputDirectory , target ) ; if ( ( javaFile . exists ( ) ) && ( ( target . lastModified ( ) ) < ( javaFile . lastModified ( ) ) ) ) { log ( ( ( "Target<seq2seq4repair_space>is<seq2seq4repair_space>already<seq2seq4repair_space>built<seq2seq4repair_space>-<seq2seq4repair_space>skipping<seq2seq4repair_space>(" + ( target ) ) + ")" ) , MSG_VERBOSE ) ; return ; } cmdl . createArgument ( ) . setValue ( target . getAbsolutePath ( ) ) ; <START_BUG> final Path classpath = cmdl . createClasspath ( project ) ; <END_BUG> final File javaccJar = JavaCC . getArchiveFile ( javaccHome ) ; classpath . createPathElement ( ) . setPath ( javaccJar . getAbsolutePath ( ) ) ; classpath . addJavaRuntime ( ) ; final Commandline . Argument arg = cmdl . createVmArgument ( ) ; arg . setValue ( "-mx140M" ) ; arg . setValue ( ( "-Dinstall.root=" + ( javaccHome . getAbsolutePath ( ) ) ) ) ; Execute . runCommand ( this , cmdl . getCommandline ( ) ) ; } protected static File getArchiveFile ( File home ) throws BuildException { } private File getOutputJavaFile ( File outputdir , File srcfile ) { } }

Fix:
final Path classpath = cmdl . createClasspath ( getProject ( ) ) ;